DropDMG provides many options for creating disk images and archives.
Configurations let you create named sets of these options, so that you can
quickly switch between your favorite combinations rather than re-entering all
the settings each time.

Use the + button to create a new configuration and the - button or the
Delete key to remove one. Several commands are available in the action menu and
contextual menu:

Make Default

Change the current configuration as shown in the DropDMG window. You can
also double-click on a configuration in the list.

Duplicate Configuration

Create a new configuration with the same options as the selected one.

Rename Configuration

Change the name of the selected configuration. You can also click-and-hold
on the name or press the Return or Enter key.

Tip: You can quickly change configurations, without first opening the
Preferences window, by using the pop-up menu in the DropDMG window, by
Control-clicking on DropDMG’s icon in the Dock, or by using Temporary
options.